Move the function "is_menu_active"

It makes more sense to have this function in fURL than in fActiveRecord
Add the notion of groups to the checks
Last changes for the upgrade of bootstrap
Upgrade of jquery-ui to version 1.10.3
Patch:reorder graphs & lines (SQL script attached)

This patch introduce to the user the ability of reordering graphs and lines.
To do so, a column was added in the lines table to introduce a weight.
Up and down arrow are now displayed so that the user can reorder by clicking.
The "drag and drop" functionnality is also allowed.
Finally, a loader screen makes the user waiting for the action to complete.
(The drag and drop functionnality needs the latest version of jquery-ui
commited previously)
New button added to edit the current dashboard